You get the Steam overlay in game (and FPS counter) and it will auto launch Quake Champions so you don't have to muck about with the Bethesda Launcher (which seems to be a point of contention for people).

If you're trying to get the steam controller + overlay, this doesn't work. Steam overlay applies to the bethedsa launcher window, not quake itself.

Anybody have any luck adding the QuakeChampions.exe shortcut to steam and running this directly? When I do that, I get overlay and controller support, but I also get asked for username/password and I get ClientError even if I use proper credentials.